For 2009, additional insulation, a more high - tech design of Acura's acoustic glass windshield, and a new Active Sound Control (ASC)
noise abatement system team to further reduce the RL's already quiet cabin.
Off the highway, Nissan's sound -
abatement efforts are most evident in the quieted mechanical
noises from the transmission and all - wheel - drive
system; they used to whine, clash and bark at low speeds.